<h1>Warning!</h1>
<p>Make sure to serve static files away from the <em>app</em> dir for security reason.
<p>static files are served with koa-static.
<p>you can change static file root in <em>app/config/SiteController.js</em>
<h2>Config sample</h2>
<pre style="background:#eee;padding:10px;">
  static_dir: {
    root: './static',
    options: {}
  },
</pre>
